( don't the police have to record everything ? ) and the officer/s badge number ( if that's the correct term for it )
That sounds the sensible route to take.

Have him use an A4 pad,so you can list multiple times on the same page.That way you can ask each stop cop to record their number and the reason for the stop.
no doubt theyll refuse to record anything,but stick to your guns and get their number,and the supposed reason for the stop
Then get an appointment with the chief cop and present your evidence.
Tell chief cop how unhappy you are and ask why this is happening[Dont make out like its a conspiracy]
You could bring up 'the independent complaints committee' but only as a last resort as the ICC usually uphold police policy[ and didnt find a problem in the Charles de Mendez case]
maybe mention that youll take the evidence to the papers/local MP
But stick to your guns and tell him how unhappy you are.